Справочник Пользователя для Mitsubishi Electronics FX

FX Series Programmable Controlers

Applied Instructions 5

5-91

e) Users of FX PLC’s have the option of allowing interrupts to occur immediately, i.e. during the

operation of the FROM/TO instructions or to wait until the completion of the current FROM/TO
instruction. This is achieved by controlling the special auxiliary flag M8028. The following table
identifies certain points associated with this control and operation.

Users of FX

have no option for interruption of the FROM/TO instructions and hence

always operate in a mode equivalent to having M8028 switched OFF.

5.8.10

TO (FNC 77)

Operation:

The TO instruction writes n words of data to the
head buffer memory address m

of the special

function block with the logical block position
specified in m

. The written data is taken from the

PLC’s head address S for n word devices.

Points to note:

All points are the same as the FROM instruction (see previous page) except point c) which is
replaced by the following:

a) The source head address for the data written TO the special function block is specified

under the S operand.

Interruption Disabled

Interruption Enabled

M8028 = OFF

M8028 = ON

Jumps called by interrupt operation are delayed
until the completion of the data transfer of the
FROM/TO instruction

Jumps called by interrupt operation occur
immediately

A small delay of (800m +200)

sec can be

expected in the worst case. Note: m = the number
of 32 bit words

Data transfer will resume upon return from the
interrupt program. This may not be desirable if a
FROM/TO instruction has been programmed
within the called interrupt

Ensures that FROM/TO instructions included in
an interrupt program will not interact with others
elsewhere

M8028 should only be used when a very short
delay is required in applications where timing and
accuracy’s are important

Mnemonic

Function

Operands

Program steps

TO
FNC 79
(TO)

Writes data to the
buffer memories
of attached
special function
blocks

K, H

Note:
m

= 0 to 7

K, H

Note:
m

=FX

(2C)

0 to 31,
FX

0 to

32767

K,H, KnX,
KnY, KnM,
KnS, T, C,
D, V, Z

K, H

Note:
16 bit op:
n= 1 to 32
32 bit op:
n= 1 to 16

TO, TOP:
9 steps

DTO, DTOP:
17 steps

0(S)

FX FX

(2C)

2N(C)

(2C)

2N(C)

0(s)

PULSE-P

(2C)

2N(C)

0(s)

16 BIT OPERATION

0(s)

(2C)

2N(C)

32 BIT OPERATION

D20

K10

[ m1 ][ m2 ] [ S ] [ n ]